Having unveiled the Classique 7147 with a delicately beautiful enamel dial earlier in the year, Breguet has now dropped an enamel dial version of the thinnest automatic tourbillon on the market. Originally introduced in 2013 with a guilloché dial (as the ref. 5377), the Classique Tourbillon Extra-Plat Automatique 5367 checks in at just 7.45mm thick, case and all.

Measuring 42mm in diameter, the Classique Tourbillon Extra-Plat 5367 is available in both platinum and rose gold, in the classic Breguet style with a narrow bezel, straight lugs and reeded caseband.

The only difference lies in the dial, which is now grand feu enamel and rid of its power reserve indicator. It features the same off-centre layout as on the guilloche version – a feature found on many historical excentré Breguet pocket watches – but with Breguet numerals in black lacquer. And the minute track is again inspired by 19th century Breguet pocket watches, with tiny lozenges for the quarters and a mystical symbol every five minutes.

The watch is powered by the cal. 581 that has a tourbillon regulator running at 4Hz. In contrast to the understated dial, the movement is richly decorated – the bridges, barrel and oscillating weight are all hand-engraved.

The identical cal. 581 as seen from the back of the ref. 5377

While the dial is classically styled, the tourbillon is contemporary in construction and materials. The tourbillon cage is made of titanium, with both the balance spring and lever escapement made of silicon. And the barrel mounted on roller bearings instead of a traditional pivot point – helping the movement stay remarkably thin – while still managing an impressive 80-hour power reserve.

Another reason the movement measures just 3mm thick is the peripheral winding system. The narrow, semi-circular platinum rotor is mounted around the edge of the calibre, instead of adding height on top of the movement bridges.

Price and Availability

The Breguet Classique Tourbillon Extra-Plat Automatique 5367 (ref. 5367BR299WU) is expected to be priced slightly lower than the existing model with a guilloche dial, which costs US$149,500 or S$214,800 in pink gold.